As I ( We ) have been attempting to relay to you there are numerous reasons that this could occur. There is just not enough data to make that determination. It is pure speculation on the cause. A catastrophic power failure ( Which has happened ), a Bird strike and ejected battery ( Which has happened ), If we had the missing 15 seconds of data, it would be a much more educated method of reasoning, but unfortunately we do not. That said, if you do find the aircraft and it will still power up, you can full the flight data from there and we can give you a better explanation and possibly a direct cause.but the point is why a brand new drone designed to bear more than 300mt altidute in an anticyclone zone (zero winds) fails like that!